What does "<...>" indicate in place of a task's name in Ftrace output?

Solution Verified - Updated -

Issue

  • The string "<...>" is seen in place of a task's name in Ftrace output:
# tracer: nop
#
# entries-in-buffer/entries-written: 661478/1968271   #P:24
#
#                              _-----=> irqs-off
#                             / _----=> need-resched
#                            | / _---=> hardirq/softirq
#                            || / _--=> preempt-depth
#                            ||| /     delay
#           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
#              | |       |   ||||       |         |
           <...>-26796 [012] .... 731445.543043: kmalloc: call_site=ffffffffa03ce7fe ptr=ffff880de4bc7000 bytes_req=1025 bytes_alloc=2048 gfp_flags=GFP_KERNEL
           <...>-26796 [012] .... 731445.543097: kmalloc: call_site=ffffffffa03ce7fe ptr=ffff880de4bc7000 bytes_req=1025 bytes_alloc=2048 gfp_flags=GFP_KERNEL
           <...>-26796 [012] .... 731445.543100: kmalloc: call_site=ffffffffa03ce7fe ptr=ffff880de4bc7000 bytes_req=1025 bytes_alloc=2048 gfp_flags=GFP_KERNEL
           <...>-26796 [012] .... 731445.543146: kmalloc: call_site=ffffffffa03ce7fe ptr=ffff880de4bc7000 bytes_req=1025 bytes_alloc=2048 gfp_flags=GFP_KERNEL
           <...>-26796 [012] .... 731445.543148: kmalloc: call_site=ffffffffa03ce7fe ptr=ffff880de4bc7000 bytes_req=1025 bytes_alloc=2048 gfp_flags=GFP_KERNEL
           <...>-26796 [012] .... 731445.543193: kmalloc: call_site=ffffffffa03ce7fe ptr=ffff880de4bc7000 bytes_req=1025 bytes_alloc=2048 gfp_flags=GFP_KERNEL
           <...>-26796 [012] .... 731445.543195: kmalloc: call_site=ffffffffa03ce7fe ptr=ffff880de4bc7000 bytes_req=1025 bytes_alloc=2048 gfp_flags=GFP_KERNEL
           <...>-26796 [012] .... 731445.543245: kmalloc: call_site=ffffffffa03ce7fe ptr=ffff880de4bc7000 bytes_req=1025 bytes_alloc=2048 gfp_flags=GFP_KERNEL
           <...>-26796 [012] .... 731445.543249: kmalloc: call_site=ffffffffa03ce7fe ptr=ffff880de4bc7000 bytes_req=1025 bytes_alloc=2048 gfp_flags=GFP_KERNEL
           <...>-26796 [012] .... 731445.543311: kmalloc: call_site=ffffffffa03ce7fe ptr=ffff880de4bc7000 bytes_req=1025 bytes_alloc=2048 gfp_flags=GFP_KERNEL
           <...>-26796 [012] .... 731445.543313: kmalloc: call_site=ffffffffa03ce7fe ptr=ffff880de4bc7000 bytes_req=1025 bytes_alloc=2048 gfp_flags=GFP_KERNEL
           <...>-26796 [012] .... 731445.543354: kmalloc: call_site=ffffffffa03ce7fe ptr=ffff880de4bc7000 bytes_req=1025 bytes_alloc=2048 gfp_flags=GFP_KERNEL
           <...>-26796 [012] .... 731445.543356: kmalloc: call_site=ffffffffa03ce7fe ptr=ffff880de4bc7000 bytes_req=1025 bytes_alloc=2048 gfp_flags=GFP_KERNEL
           <...>-26796 [012] .... 731445.543405: kmalloc: call_site=ffffffffa03ce7fe ptr=ffff880de4bc7000 bytes_req=1025 bytes_alloc=2048 gfp_flags=GFP_KERNEL
           <...>-26796 [012] .... 731445.543407: kmalloc: call_site=ffffffffa03ce7fe ptr=ffff880de4bc7000 bytes_req=1025 bytes_alloc=2048 gfp_flags=GFP_KERNEL
           <...>-26796 [012] .... 731445.543476: kmalloc: call_site=ffffffffa03ce7fe ptr=ffff880de4bc7000 bytes_req=1025 bytes_alloc=2048 gfp_flags=GFP_KERNEL
           <...>-26796 [012] .... 731445.543478: kmalloc: call_site=ffffffffa03ce7fe ptr=ffff880de4bc7000 bytes_req=1025 bytes_alloc=2048 gfp_flags=GFP_KERNEL
           <...>-26796 [012] .... 731445.543529: kmalloc: call_site=ffffffffa03ce7fe ptr=ffff880de4bc7000 bytes_req=1025 bytes_alloc=2048 gfp_flags=GFP_KERNEL
           <...>-26796 [012] .... 731445.543531: kmalloc: call_site=ffffffffa03ce7fe ptr=ffff880de4bc7000 bytes_req=1025 bytes_alloc=2048 gfp_flags=GFP_KERNEL

Environment

  • Red Hat Enterprise Linux 7.2

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